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Distributed Storage Manager System for Synchronized and Scalable AV Services across Networks 用于跨网络同步和可扩展AV服务的分布式存储管理器系统
Int. J. Digit. Multim. Broadcast. Pub Date : 2011-06-14 DOI: 10.1155/2011/687071
F. Sun, J. Cosmas, Muhammad Ali Farmer, A. Waheed
{"title":"Distributed Storage Manager System for Synchronized and Scalable AV Services across Networks","authors":"F. Sun, J. Cosmas, Muhammad Ali Farmer, A. Waheed","doi":"10.1155/2011/687071","DOIUrl":"https://doi.org/10.1155/2011/687071","url":null,"abstract":"This paper provides an innovative solution, namely, the distributed storage manager that opens a new path for highly interactive and personalized services. The distributed storage manager provides an enhancement to the MHP storage management functionality acting as a value added middleware distributed across the network. The distributed storage manager system provides multiple protocol support for initializing and downloading both streamed and file-based content and provides optimum control mechanisms to organize the storing and retrieval of content that are remained accessible to other multiple heterogeneous devices.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115539628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Exploration of Network Coding in IEEE 802.15.4 Networks IEEE 802.15.4网络中网络编码的探索
Int. J. Digit. Multim. Broadcast. Pub Date : 2011-06-13 DOI: 10.1155/2011/310647
Deze Zeng, Song Guo, Victor C. M. Leung, Jiankun Hu
{"title":"The Exploration of Network Coding in IEEE 802.15.4 Networks","authors":"Deze Zeng, Song Guo, Victor C. M. Leung, Jiankun Hu","doi":"10.1155/2011/310647","DOIUrl":"https://doi.org/10.1155/2011/310647","url":null,"abstract":"Wireless personal area networks (WPANs) are getting popular in a variety of fields such as smart home, office automation, and e-healthcare. In WPANs, most devices are considerably energy constrained, so the communication protocol should be energy efficient. The IEEE 802.15.4 is designed as a standard protocol for low power, low data rate, low complexity, and short range connections in WPANs. The standard supports allocating several numbers of collision-free guarantee time slots (GTSs) within a superframe for some time-critical transmissions. Recently, COPE was proposed as a promising network coding architecture to essentially improve the throughput of wireless networks. In this paper, we exploit the network coding technique at coordinators to improve energy efficiency of the WPAN. Some related practical issues, such as GTS allocation and multicast, are also discussed in order to exploit the network coding opportunities efficiently. Since the coding opportunities are mostly exploited, our proposal achieves both higher energy efficiency and throughput performance than the original IEEE 802.15.4.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133762081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Cognitive Radio for Smart Grid: Theory, Algorithms, and Security 智能电网的认知无线电:理论、算法和安全
Int. J. Digit. Multim. Broadcast. Pub Date : 2011-06-13 DOI: 10.1155/2011/502087
R. Ranganathan, R. Qiu, Zhen Hu, S. Hou, Marbin Pazos-Revilla, Gang Zheng, Zhe Chen, N. Guo
{"title":"Cognitive Radio for Smart Grid: Theory, Algorithms, and Security","authors":"R. Ranganathan, R. Qiu, Zhen Hu, S. Hou, Marbin Pazos-Revilla, Gang Zheng, Zhe Chen, N. Guo","doi":"10.1155/2011/502087","DOIUrl":"https://doi.org/10.1155/2011/502087","url":null,"abstract":"Recently, cognitive radio and smart grid are two areas which have received considerable research impetus. Cognitive radios are intelligent software defined radios (SDRs) that efficiently utilize the unused regions of the spectrum, to achieve higher data rates. The smart grid is an automated electric power system that monitors and controls grid activities. In this paper, the novel concept of incorporating a cognitive radio network as the communications infrastructure for the smart grid is presented. A brief overview of the cognitive radio, IEEE 802.22 standard and smart grid, is provided. Experimental results obtained by using dimensionality reduction techniques such as principal component analysis (PCA), kernel PCA, and landmark maximum variance unfolding (LMVU) on Wi-Fi signal measurements are presented in a spectrum sensing context. Furthermore, compressed sensing algorithms such as Bayesian compressed sensing and the compressed sensing Kalman filter is employed for recovering the sparse smart meter transmissions. From the power system point of view, a supervised learning method called support vector machine (SVM) is used for the automated classification of power system disturbances. The impending problem of securing the smart grid is also addressed, in addition to the possibility of applying FPGA-based fuzzy logic intrusion detection for the smart grid.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130069894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 47
Location Discovery Based on Fuzzy Geometry in Passive Sensor Networks 无源传感器网络中基于模糊几何的位置发现
Int. J. Digit. Multim. Broadcast. Pub Date : 2011-06-02 DOI: 10.1155/2011/851951
Rui Wang, W. Cao, W. Wan
{"title":"Location Discovery Based on Fuzzy Geometry in Passive Sensor Networks","authors":"Rui Wang, W. Cao, W. Wan","doi":"10.1155/2011/851951","DOIUrl":"https://doi.org/10.1155/2011/851951","url":null,"abstract":"Location discovery with uncertainty using passive sensor networks in the nation's power grid is known to be challenging, due to the massive scale and inherent complexity. For bearings-only target localization in passive sensor networks, the approach of fuzzy geometry is introduced to investigate the fuzzy measurability for a moving target in R2 space. The fuzzy analytical bias expressions and the geometrical constraints are derived for bearings-only target localization. The interplay between fuzzy geometry of target localization and the fuzzy estimation bias for the case of fuzzy linear observer trajectory is analyzed in detail in sensor networks, which can realize the 3-dimensional localization including fuzzy estimate position and velocity of the target by measuring the fuzzy azimuth angles at intervals of fixed time. Simulation results show that the resulting estimate position outperforms the traditional least squares approach for localization with uncertainty.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132320049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Utility-Based Joint Routing, Network Coding, and Power Control for Wireless Ad Hoc Networks 无线自组织网络基于效用的联合路由、网络编码和功率控制
Int. J. Digit. Multim. Broadcast. Pub Date : 2011-05-15 DOI: 10.1155/2011/786915
Kaiqian Ou, Yinlong Xu, Xiumin Wang, Wang-gui Liu
{"title":"Utility-Based Joint Routing, Network Coding, and Power Control for Wireless Ad Hoc Networks","authors":"Kaiqian Ou, Yinlong Xu, Xiumin Wang, Wang-gui Liu","doi":"10.1155/2011/786915","DOIUrl":"https://doi.org/10.1155/2011/786915","url":null,"abstract":"Energy saving and high delivery reliability are two essential metrics in wireless ad hoc networks. In this paper, we propose a joint power control and network coding (PCNC) scheme which regulates the transmission power to reduce the overall energy usage and uses network coding to improve reliability by reducing the number of packet retransmissions. To argue for PCNC scheme, we investigate both unicast and multicast routing scenarios. To evaluate routing optimality, we adopt expected utility as a metric, which integrates energy cost, reliability, and benefit value. Based on the expected utility, we explore the optimality in both unicast and multicast routing. For unicast routing, we propose an optimal algorithm. We show the NP-hardness of multicast routing problem, and also design a heuristic solution. Results from simulations demonstrate that PCNC improves the performance in terms of expected utility compared with existing techniques.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126235500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
PAPR Reduction Approach Based on Channel Estimation Pilots for Next Generations Broadcasting Systems 下一代广播系统中基于信道估计导频的PAPR降低方法
Int. J. Digit. Multim. Broadcast. Pub Date : 2011-01-04 DOI: 10.1155/2011/365896
A. Ho, J. Hélard, Y. Nasser, Y. Louët
{"title":"PAPR Reduction Approach Based on Channel Estimation Pilots for Next Generations Broadcasting Systems","authors":"A. Ho, J. Hélard, Y. Nasser, Y. Louët","doi":"10.1155/2011/365896","DOIUrl":"https://doi.org/10.1155/2011/365896","url":null,"abstract":"A novel peak-to-average power ratio (PAPR) reduction technique for orthogonal frequency division multiplexing (OFDM) systems is addressed. Instead of using dedicated pilots for PAPR reduction as with tone reservation (TR) method selected by the DVB-T2 standard, we propose to use existing pilots used for channel estimation. In this way, we avoid the use of reserved tone pilots and then improve the spectral efficiency of the system. In order to allow their recovery at the receiver, these pilots have to follow particular laws which permit their blind detection and avoid sending side information. In this work, we propose and investigate a multiplicative law operating in discrete frequency domain. The operation in discrete domain aims at reducing degradation due to detection and estimation error in continuous domain. Simulation results are performed using the new DVB-T2 standard parameters. Its performance is compared to the DVB-T2 PAPR gradient algorithm and to the second-order cone programming (SOCP) competitive technique proposed in the literature. We show that the proposed technique is efficient in terms of PAPR reduction value and of spectral efficiency while the channel estimation performance is maintained.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124461437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Design and Implementation of a Mobile Multihop WSN for AGV System AGV移动多跳无线传感器网络的设计与实现
Int. J. Digit. Multim. Broadcast. Pub Date : 2010-12-27 DOI: 10.1155/2010/108726
Jiaqi Zhang, M. Jia, N. Yamauchi, T. Baba
{"title":"Design and Implementation of a Mobile Multihop WSN for AGV System","authors":"Jiaqi Zhang, M. Jia, N. Yamauchi, T. Baba","doi":"10.1155/2010/108726","DOIUrl":"https://doi.org/10.1155/2010/108726","url":null,"abstract":"A system data sharing protocol of mobile WSN named synchronous dynamic multihop data sharing protocol (S-DMDS) is presented for automated guided vehicle (AGV) system. It is a cross-layer protocol designed from route layer to MAC layer. By adopting a concept of system data sharing, it is possible to make each node exchange the data timely with all the other nodes. It is also a topology-agnostic protocol which has no knowledge of neighbors, routes, or next hops. From the results of the 16-nodes simulation, S-DMDS protocol is proved to be efficient exchange data timely between the devices of AGV system in mobile multihop situation. Moreover, it also shows that S-DMDS significantly outperforms NST-AODV with investing about 41.6% system sharing delay as well as 80% RAM consumption. At last, 5-node experiment indicates that S-DMDS can work well in real environment.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127926727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Adaptive Probabilistic Broadcasting over Dense Wireless Ad Hoc Networks 密集无线自组织网络的自适应概率广播
Int. J. Digit. Multim. Broadcast. Pub Date : 2010-12-02 DOI: 10.1155/2010/741792
V. Gau, Jenq-Neng Hwang
{"title":"Adaptive Probabilistic Broadcasting over Dense Wireless Ad Hoc Networks","authors":"V. Gau, Jenq-Neng Hwang","doi":"10.1155/2010/741792","DOIUrl":"https://doi.org/10.1155/2010/741792","url":null,"abstract":"We propose an idle probability-based broadcasting method, iPro, which employs an adaptive probabilistic mechanism to improve performance of data broadcasting over dense wireless ad hoc networks. In multisource one-hop broadcast scenarios, the modeling and simulation results of the proposed iPro are shown to significantly outperform the standard IEEE 802.11 under saturated condition. Moreover, the results also show that without estimating the number of competing nodes and changing the contention window size, the performance of the proposed iPro can still approach the theoretical bound. We further apply iPro to multihop broadcasting scenarios, and the experiment results show that within the same elapsed time after the broadcasting, the proposed iPro has significantly higher Packet-Delivery Ratios (PDR) than traditional methods.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115179851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Interference Coordination for E-MBMS Transmissions in LTE-Advanced LTE-Advanced中E-MBMS传输的干扰协调
Int. J. Digit. Multim. Broadcast. Pub Date : 2010-10-25 DOI: 10.1155/2010/689705
Alberto A. Lopes, José Seguro, Paulo Gomes, N. Souto, A. Correia
{"title":"Interference Coordination for E-MBMS Transmissions in LTE-Advanced","authors":"Alberto A. Lopes, José Seguro, Paulo Gomes, N. Souto, A. Correia","doi":"10.1155/2010/689705","DOIUrl":"https://doi.org/10.1155/2010/689705","url":null,"abstract":"Interference coordination methods for Evolved-Multimedia Broadcast/Multicast Service (E-MBMS) in Long-Term Evolution Advanced (LTE-A) are presented. In addition, we consider signal space diversity based on Rotation Matrices (RM) known to provide good performance gains over uncorrelated Rayleigh fading channels. OFDM/OFDMA systems can make the use of RM very attractive both for single and multiple antenna transmissions. In this paper, OFDM/OFDMA signals based on LTE parameters are combined with RM, MIMO, Turbo, or LDPC codes. We have considered different types of receivers, namely, we used an MMSE (Minimum Mean Squared Error) equalizer and a Maximum Likelihood Soft Output criterion (MLSO). Frequency, signal, and space diversity gains are evaluated for different spatial channel models (SCM) based on ITU multipath propagation channels. Different adaptive frequency reuse and schedulers are considered to evaluate the E-MBMS spectral efficiency at the cell borders.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126585824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Performance and Implementation Evaluation of TR PAPR Reduction Methods for DVB-T2 DVB-T2的TR - PAPR降低方法的性能与实施评价
Int. J. Digit. Multim. Broadcast. Pub Date : 2010-09-26 DOI: 10.1155/2010/797393
M. Mroué, A. Nafkha, J. Palicot, Benjamin Gavalda, Nelly Dagorne
{"title":"Performance and Implementation Evaluation of TR PAPR Reduction Methods for DVB-T2","authors":"M. Mroué, A. Nafkha, J. Palicot, Benjamin Gavalda, Nelly Dagorne","doi":"10.1155/2010/797393","DOIUrl":"https://doi.org/10.1155/2010/797393","url":null,"abstract":"High Peak to Average Power Ratio (PAPR) is a critical issue in multicarrier communication systems using Orthogonal Frequency Division Multiplexing (OFDM), as in the Second Generation Terrestrial Digital Video Broadcasting (DVB-T2) system. This problem can result in large performance degradation due to the nonlinearity of the High Power Amplifier (HPA) or in its low power efficiency. In this paper, we evaluate the performance of different Tone Reservation-based techniques for PAPR reduction in DVB-T2 context. Also, we propose an iterative TR-based technique called \"One Kernel One Peak\" (OKOP). Simulation results and performance comparison of these techniques in terms of gain in PAPR reduction, mean power variation, and complexity will be given. Finally, we describe the implementation of a PAPR reduction algorithm in the DVB-T2 modulator.","PeriodicalId":204253,"journal":{"name":"Int. J. Digit. Multim. Broadcast.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115753194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
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